From: Richard Whitlock <richard.whitlo@btconnect.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: linux-ide@vger.kernel.org
Subject: Re: UDMA failure with UDMA/100 CF card, pata_pdc2027x, MPC8347
Date: Tue, 09 Sep 2008 16:02:28 +0100 [thread overview]
Message-ID: <48C69004.9030709@btconnect.com> (raw)
In-Reply-To: <20080909145811.55cc4726@lxorguk.ukuu.org.uk>
>> Having throttled back to PIO4, it seems to work - but does anyone have
>> any ideas why the exceptions in all UDMA modes?
>>
>
> Usually with a CFA device it means you are not using a UDMA capable (and
> UDMA rated) adapter. Unfortunately while proper ATA cabling and devices
> have a negotiation system there isn't a way to discover this particular
> situation.
>
We have a 2.6.20 port which uses arch/ppc (rather than arch/powerpc)
which works fine on identical hardware, so I think everything is UDMA
capable.
With our 2.6.20 ppc port, libata configures my lexar 4GB 300x CF card to
run at UDMA/100 within about 1.5 seconds - since it works so well, I
never really looked at the mechanics of it.
Any more ideas?
next prev parent reply other threads:[~2008-09-09 14:57 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-09-09 13:38 UDMA failure with UDMA/100 CF card, pata_pdc2027x, MPC8347 Richard Whitlock
2008-09-09 13:58 ` Alan Cox
2008-09-09 15:02 ` Richard Whitlock [this message]
2008-09-09 16:08 ` Alan Cox
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=48C69004.9030709@btconnect.com \
--to=richard.whitlo@btconnect.com \
--cc=alan@lxorguk.ukuu.org.uk \
--cc=linux-ide@vger.kernel.org \
--cc=richw@netcomuk.co.uk \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.